Remove obsolete __DOXYGEN_ONLY__ blocks

__DOXYGEN_ONLY__ blocks were only used to typeset the PSA specification
back when it was extracted from Mbed TLS headers. They are no longer
used and should be removed.

The PSA Crypto Driver API is still under development and might be
extracted from Mbed TLS headers, leaving them there for now.

Signed-off-by: Janos Follath <janos.follath@arm.com>
diff --git a/include/psa/crypto.h b/include/psa/crypto.h
index 970aea3..7efa315 100644
--- a/include/psa/crypto.h
+++ b/include/psa/crypto.h
@@ -112,12 +112,6 @@
  * This macro returns a suitable initializer for a key attribute structure
  * of type #psa_key_attributes_t.
  */
-#ifdef __DOXYGEN_ONLY__
-/* This is an example definition for documentation purposes.
- * Implementations should define a suitable value in `crypto_struct.h`.
- */
-#define PSA_KEY_ATTRIBUTES_INIT {0}
-#endif
 
 /** Return an initial value for a key attributes structure.
  */
@@ -947,12 +941,6 @@
  * This macro returns a suitable initializer for a hash operation object
  * of type #psa_hash_operation_t.
  */
-#ifdef __DOXYGEN_ONLY__
-/* This is an example definition for documentation purposes.
- * Implementations should define a suitable value in `crypto_struct.h`.
- */
-#define PSA_HASH_OPERATION_INIT {0}
-#endif
 
 /** Return an initial value for a hash operation object.
  */
@@ -1318,12 +1306,6 @@
  * This macro returns a suitable initializer for a MAC operation object of type
  * #psa_mac_operation_t.
  */
-#ifdef __DOXYGEN_ONLY__
-/* This is an example definition for documentation purposes.
- * Implementations should define a suitable value in `crypto_struct.h`.
- */
-#define PSA_MAC_OPERATION_INIT {0}
-#endif
 
 /** Return an initial value for a MAC operation object.
  */
@@ -1742,12 +1724,6 @@
  * This macro returns a suitable initializer for a cipher operation object of
  * type #psa_cipher_operation_t.
  */
-#ifdef __DOXYGEN_ONLY__
-/* This is an example definition for documentation purposes.
- * Implementations should define a suitable value in `crypto_struct.h`.
- */
-#define PSA_CIPHER_OPERATION_INIT {0}
-#endif
 
 /** Return an initial value for a cipher operation object.
  */
@@ -2271,12 +2247,6 @@
  * This macro returns a suitable initializer for an AEAD operation object of
  * type #psa_aead_operation_t.
  */
-#ifdef __DOXYGEN_ONLY__
-/* This is an example definition for documentation purposes.
- * Implementations should define a suitable value in `crypto_struct.h`.
- */
-#define PSA_AEAD_OPERATION_INIT {0}
-#endif
 
 /** Return an initial value for an AEAD operation object.
  */
@@ -3271,12 +3241,6 @@
  * This macro returns a suitable initializer for a key derivation operation
  * object of type #psa_key_derivation_operation_t.
  */
-#ifdef __DOXYGEN_ONLY__
-/* This is an example definition for documentation purposes.
- * Implementations should define a suitable value in `crypto_struct.h`.
- */
-#define PSA_KEY_DERIVATION_OPERATION_INIT {0}
-#endif
 
 /** Return an initial value for a key derivation operation object.
  */
@@ -4360,12 +4324,6 @@
  * This macro returns a suitable initializer for an PAKE operation object of
  * type #psa_pake_operation_t.
  */
-#ifdef __DOXYGEN_ONLY__
-/* This is an example definition for documentation purposes.
- * Implementations should define a suitable value in `crypto_struct.h`.
- */
-#define PSA_PAKE_OPERATION_INIT {0}
-#endif
 
 /** Return an initial value for an PAKE operation object.
  */